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Polyester microfiber unique to increase the difficulty of dyeing
May 07, 2018

Polyester microfiber is divided into three types: sea-island type, orange petal wire and spun silk.

The most remarkable feature of polyester microfibers is that their single filament denier is much lower than that of ordinary fibers. The garments made of polyester microfibers are comfortable, beautiful, warm and breathable, have good drape and fullness, and have obvious advantages in terms of hydrophobicity and antifouling properties.

Polyester microfibers will encounter many technical problems in the printing and dyeing process. Take the example of PET island ultrafine fiber imitation suede varieties. First, the dyeing depth is poor, because the surface area of island-type microfibers is larger than that of conventional polyester fibers. Times, resulting in a large amount of reflected light on the surface of the fiber, and the degree of shade of the dyed fabric is related to the reflected light on the surface of the fiber and the refracted light returned from the inside of the fiber to the outside. Therefore, in the same amount of dye, the island-in-the-sea microfiber is more conventional Polyester fiber has a much lighter color depth. The second is poor color fastness, which is also due to the fact that the surface area of ultrafine fibers is many times larger than that of conventional polyester fibers. In the case of the same amount of dye, the amount of dye per unit area is much lower. To achieve the same apparent depth, the dye Should also be increased by the same proportion, resulting in doubled growth of the amount of disperse dyes, the color fastness decreased significantly. Third, poor level dyeing, disperse dye uptake rate and fiber radius and surface area related to ultra-fine fibers because of the small linear density, surface area, dye adsorption rate, easy to produce uneven dyeing. These above-mentioned factors impose higher requirements on the technical level of dyestuff manufacturers and printing and dyeing enterprises of polyester microfiber fabrics.

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